Abstract
The effects of variation of amount and type of calcium sulfate on the early behaviour of hydrating Portland cement were examined. Initial setting of pastes determined via the Vicat needle penetration method indicates that not only the amount but also the type of set regulator has a substantial impact on early properties of hydrating cement. The influence of the type not only depends on its concentration but also on the Portland cement clinker used. In the measurement of ultrasonic P-wave velocity of hydrating pastes, different stages of strength gain can be defined. The successive addition of set regulators changes the material properties in these stages in different ways. Examinations lead to the conclusion that differences in the prepared samples are mainly due to different solubility of calcium sulfate types, early ettringite formation and the amount of reacting aluminate phases of the clinker.
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Acknowledgement
The authors are thankful to German Federal Ministry of Education and Research for funding this work in the scope of project BauProAddi (FKZ: 03XP0122A). Furthermore, acknowledgement goes to Opterra Zement GmbH for the supply of material and to Ms Charline Gruhn and Mr Falk Martin for their assistance in the laboratory.
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Hirsch, T., Dorn, T., Stephan, D. (2020). Early Properties of Portland Cements with Varied Set Regulators. In: Mechtcherine, V., Khayat, K., Secrieru, E. (eds) Rheology and Processing of Construction Materials. RheoCon SCC 2019 2019. RILEM Bookseries, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-030-22566-7_12
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DOI: https://doi.org/10.1007/978-3-030-22566-7_12
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